Uninstall Cloud Service Mesh

This page explains how to uninstall Cloud Service Mesh.

Uninstall Cloud Service Mesh

Use the following commands to uninstall all Cloud Service Mesh components. These commands also delete the istio-system namespace and all custom resource definitions (CRDs), including any CRDs that you applied.

To prevent interruption of application traffic:
- Downgrade any STRICT mTLS policies to PERMISSIVE.
- Remove any AuthorizationPolicy that may block traffic.
Disable Automatic Managed Cloud Service Mesh through the Fleet API, if it is enabled.
Disable sidecar auto-injection on your namespace(s), if it is enabled. Run the following command to display namespace labels:
```
 kubectl get namespace YOUR_NAMESPACE --show-labels
```
The output is similar to the following:
```
 NAME   STATUS   AGE     LABELS
 demo   Active   4d17h   istio.io/rev=asm-181-5
```
If you see istio.io/rev= in the output under the LABELS column, remove it:
```
 kubectl label namespace YOUR_NAMESPACE istio.io/rev-
```
If you see istio-injection in the output under the LABELS column, remove it:
```
 kubectl label namespace YOUR_NAMESPACE istio-injection-
```
If you don't see either the istio.io/rev or istio-injection labels, then auto-injection wasn't enabled on the namespace.
Restart your workloads that have sidecars injected to remove the proxies.
If you're using managed Cloud Service Mesh, remove any controlplanerevision resources in the cluster:
```
kubectl delete controlplanerevision RELEASE_CHANNEL -n istio-system
```
Where RELEASE_CHANNEL is the release channel you provisioned, such as asm-managed, asm-managed-rapid, or asm-managed-stable.
Delete webhooks from your cluster, if they exist.
In-cluster Cloud Service Mesh
Delete the validatingwebhooksconfiguration and mutatingwebhookconfiguration.
```
kubectl delete validatingwebhookconfiguration,mutatingwebhookconfiguration -l operator.istio.io/component=Pilot
```
Managed Cloud Service Mesh
A. Delete the validatingwebhooksconfiguration.
```
kubectl delete validatingwebhookconfiguration istiod-istio-system-mcp
```
B. Delete the mutatingwebhookconfiguration.

Note: Use the RELEASE_CHANNEL according to the release channel you provisioned. For example, Regular(istiod-asm-managed), Rapid (istiod-asm-managed-rapid), and Stable (istiod-asm-managed-stable).
```
kubectl delete mutatingwebhookconfiguration RELEASE_CHANNEL
```
Once all workloads come up and no proxies are observed, then you can safely delete the in-cluster control plane to stop billing. If you deployed a managed control plane, then it is automatically deleted with the previous step.

To remove the in-cluster control plane, run the command below:
```
istioctl x uninstall --purge
```
If there are no other control planes, you can delete the istio-system namespace to get rid of all Cloud Service Mesh resources. Otherwise, delete the services corresponding to the Cloud Service Mesh revisions. This avoids deleting shared resources, such as CRDs.

Delete the istio-system and asm-system namespaces:

 kubectl delete namespace istio-system asm-system --ignore-not-found=true

Check if the deletions were successful:
```
 kubectl get ns
```
The output should indicate a Terminating state and return as shown, otherwise you might have to manually delete any remaining resources in the namespaces and try again.
```
 NAME                 STATUS       AGE
 istio-system         Terminating  71m
 asm-system           Terminating  71m
```
If you're using managed Cloud Service Mesh, delete the mdp-controller deployment:
```
 kubectl delete deployment mdp-controller -n kube-system
```

Delete the istio-cni-node daemonset:

 kubectl delete daemonset istio-cni-node -n kube-system

Follow the steps to unregister each cluster from your fleet. This step is required even if you deleted the cluster, since deleted clusters may still be registered to your fleet.

Uninstall Cloud Service Mesh

Uninstall Cloud Service Mesh

In-cluster Cloud Service Mesh

Managed Cloud Service Mesh